<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Json
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Http.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Json_Server_Response
 */
require_once 'Zend/Json/Server/Response.php';

/**
 *
 * @category Zend
 * @package Zend_Json
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Json_Server_Response_Http extends Zend_Json_Server_Response {

    /**
     * Emit JSON
     * Send appropriate HTTP headers.
     * If no Id, then return an empty string.
     * @return string
     */
    public function toJson () {
        $this -> sendHeaders ();
        if ( ! $this -> isError () && null === $this -> getId ()) {
            return '';
        }
        return parent::toJson ();
    }

    /**
     * Send headers
     * If headers are already sent, do nothing.
     * If null ID, send HTTP 204
     * header. Otherwise, send content type header based on content type of
     * service map.
     * @return void
     */
    public function sendHeaders () {
        if (headers_sent ()) {
            return;
        }
        if ( ! $this -> isError () && (null === $this -> getId ())) {
            header ('HTTP/1.1 204 No Content');
            return;
        }
        if (null === ($smd = $this -> getServiceMap ())) {
            return;
        }
        $contentType = $smd -> getContentType ();
        if ( ! empty ($contentType)) {
            header ('Content-Type: ' . $contentType);
        }
    }

}
